Geology · Glossary
Earthquake Fault Zone
Updated 2026-07-20
Alquist-Priolo Earthquake Fault Zones are mapped corridors where surface fault rupture hazard triggers special geologic study before many structures are permitted.
What it means
Alquist-Priolo Earthquake Fault Zones are mapped corridors where surface fault rupture hazard triggers special geologic study before many structures are permitted.
Why it matters for land decisions
Confirm how the concept applies to your specific parcel with the city or county planning department and the controlling agency map or ordinance.
- Treat online GIS as a first-pass screen.
- Verify before design, escrow, or lending decisions.
People also ask
What is Earthquake Fault Zone?
Alquist-Priolo Earthquake Fault Zones are mapped corridors where surface fault rupture hazard triggers special geologic study before many structures are permitted.
Is a GIS overlay enough to decide?
No. Public GIS is a screening tool. Official determinations come from the governing agency, recorded documents, and licensed professionals when required.
Official sources
Related terms
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